*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* ── Hero (Welcome) ── */
.hero {
  text-align: center;
  padding: 3rem 2rem;
}
.hero h1 { font-size: 2.8rem; color: #4f46e5; margin-bottom: .5rem; }
.hero p  { font-size: 1.1rem; color: #555; margin-bottom: 2rem; }

/* ── Auth Card ── */
.card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
}
.card h2 { margin-bottom: 1.5rem; color: #4f46e5; }
.card label { display: block; font-size: .85rem; font-weight: 600; margin: .8rem 0 .3rem; }
.card input { width: 100%; padding: .6rem .8rem; border: 1px solid #d1d5db; border-radius: 8px; font-size: .95rem; }
.card hr { margin: 1.2rem 0; border: none; border-top: 1px solid #e5e7eb; }
.card .center { text-align: center; margin-top: 1rem; font-size: .9rem; }

/* ── App Layout ── */
body.app-layout {
  flex-direction: row;
  align-items: stretch;
  justify-content: flex-start;
}

.sidebar {
  width: 220px;
  min-height: 100vh;
  background: #1e1b4b;
  color: #c7d2fe;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  flex-shrink: 0;
}
.sidebar .logo { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 2rem; }
.sidebar ul { list-style: none; flex: 1; }
.sidebar ul li { margin-bottom: .3rem; }
.sidebar ul a {
  display: block; padding: .55rem .8rem; border-radius: 8px;
  color: #c7d2fe; text-decoration: none; font-size: .9rem;
  transition: background .15s;
}
.sidebar ul a:hover, .sidebar ul a.active {
  background: #4f46e5; color: #fff;
}
.sidebar .logout { margin-top: 1rem; text-align: center; }

.content {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}
.content h2 { font-size: 1.6rem; margin-bottom: 1.5rem; color: #1e1b4b; }
.content h3 { font-size: 1.1rem; margin: 1.5rem 0 .8rem; color: #374151; }

/* ── Buttons ── */
.btn {
  display: inline-block; padding: .55rem 1.2rem; border-radius: 8px;
  font-size: .9rem; font-weight: 600; cursor: pointer;
  border: none; text-decoration: none; transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary  { background: #4f46e5; color: #fff; }
.btn-secondary{ background: #e5e7eb; color: #374151; }
.btn-danger   { background: #ef4444; color: #fff; }
.btn-google   { background: #fff; border: 1px solid #d1d5db; color: #374151; display: flex; align-items: center; gap: .5rem; justify-content: center; }
.full-width   { width: 100%; margin-top: .8rem; }

/* ── Tables ── */
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
th { background: #f9fafb; padding: .75rem 1rem; text-align: left; font-size: .8rem; text-transform: uppercase; color: #6b7280; }
td { padding: .75rem 1rem; border-top: 1px solid #f3f4f6; font-size: .9rem; }
td.actions a { margin-right: .5rem; color: #4f46e5; text-decoration: none; font-size: .85rem; }
td.actions a.danger { color: #ef4444; }

/* ── Badges ── */
.badge { padding: .2rem .6rem; border-radius: 999px; font-size: .75rem; font-weight: 600; }
.badge.green  { background: #d1fae5; color: #065f46; }
.badge.yellow { background: #fef3c7; color: #92400e; }
.badge.blue   { background: #dbeafe; color: #1e40af; }

/* ── Stats ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px,1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card { background: #fff; border-radius: 10px; padding: 1.2rem; text-align: center; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.stat-num { display: block; font-size: 1.8rem; font-weight: 700; color: #4f46e5; }
.stat-label { font-size: .8rem; color: #6b7280; }

/* ── Page Header ── */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }

/* ── Filter Input ── */
.filter-input { padding: .55rem .8rem; border: 1px solid #d1d5db; border-radius: 8px; font-size: .9rem; width: 100%; max-width: 320px; margin-bottom: 1rem; }
.filter-input.inline { margin-bottom: 0; }

/* ── Product Grid ── */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 1.2rem; }
.product-card { background: #fff; border-radius: 10px; padding: 1.5rem; text-align: center; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.product-img { font-size: 2.5rem; margin-bottom: .8rem; }
.product-card h4 { margin-bottom: .4rem; }
.product-card p { font-size: .85rem; color: #6b7280; margin-bottom: .6rem; }
.stars { color: #f59e0b; margin-bottom: .8rem; }

/* ── Calculators ── */
.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); gap: 1.2rem; }
.calc-card { background: #fff; border-radius: 10px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.calc-card h4 { margin-bottom: 1rem; color: #4f46e5; }
.calc-card label { display: block; font-size: .8rem; font-weight: 600; margin: .6rem 0 .2rem; }
.calc-card input { width: 100%; padding: .5rem .7rem; border: 1px solid #d1d5db; border-radius: 6px; font-size: .9rem; }
.calc-card .btn { margin-top: .8rem; }
.result { margin-top: .8rem; font-size: .9rem; color: #374151; }

/* ── Plans ── */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); gap: 1.5rem; max-width: 600px; }
.plan-card { background: #fff; border-radius: 12px; padding: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); position: relative; }
.plan-card.featured { border: 2px solid #4f46e5; }
.badge-top { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: #4f46e5; color: #fff; padding: .2rem .8rem; border-radius: 999px; font-size: .75rem; font-weight: 700; }
.plan-card h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.price { font-size: 2rem; font-weight: 700; color: #4f46e5; margin-bottom: 1rem; }
.price span { font-size: 1rem; color: #6b7280; }
.plan-card ul { list-style: none; margin-bottom: 1.5rem; }
.plan-card ul li { padding: .3rem 0; font-size: .9rem; color: #374151; }

/* ── Blockchain ── */
.wallet-status { display: flex; align-items: center; gap: .8rem; background: #fff; padding: 1rem 1.5rem; border-radius: 10px; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.disconnected { background: #ef4444; }
.dot.connected    { background: #10b981; }
.op-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 1.2rem; }
.op-card { background: #fff; border-radius: 10px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.op-card h4 { margin-bottom: .8rem; color: #4f46e5; }
.op-card input { width: 100%; padding: .5rem .7rem; border: 1px solid #d1d5db; border-radius: 6px; font-size: .9rem; margin-bottom: .5rem; }
.op-card .btn { margin-top: .3rem; }
pre.output { margin-top: .8rem; background: #f9fafb; padding: .6rem; border-radius: 6px; font-size: .8rem; color: #374151; }

/* ── Search ── */
.search-bar { display: flex; gap: .8rem; margin-bottom: 1.5rem; }
.search-bar .filter-input { flex: 1; max-width: none; margin-bottom: 0; }
.muted { color: #9ca3af; font-size: .9rem; }

/* ── Footer ── */
footer { margin-top: 2rem; color: #9ca3af; font-size: .85rem; }

/* ── Btn group ── */
.btn-group { display: flex; gap: 1rem; justify-content: center; }

/* ── Mobile & Responsive ────────────────────────────────────────────────── */

@media (max-width: 768px) {
  /* Sidebar becomes hamburger-controlled overlay */
  body.app-layout {
    flex-direction: column;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: -250px;
    width: 250px;
    height: 100vh;
    z-index: 999;
    transition: left .3s ease;
    box-shadow: 4px 0 12px rgba(0,0,0,.15);
  }

  .sidebar.open {
    left: 0;
  }

  /* Hamburger toggle button */
  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
    background: #4f46e5;
    border: none;
    border-radius: 8px;
    padding: .6rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
  }

  .hamburger span {
    width: 20px;
    height: 2px;
    background: #fff;
    transition: transform .2s, opacity .2s;
  }

  .hamburger.open span:nth-child(1) { transform: rotate(45deg) translateY(6px); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translateY(-6px); }

  /* Overlay backdrop */
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 998;
  }

  .sidebar-backdrop.open {
    display: block;
  }

  /* Content takes full width */
  .content {
    width: 100%;
    padding: 4rem 1rem 1rem;
  }

  /* Stats grid responsive */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Product grid single column on small screens */
  .product-grid {
    grid-template-columns: 1fr;
  }

  /* Calculator grid single column */
  .calc-grid {
    grid-template-columns: 1fr;
  }

  /* Plan grid single column */
  .plan-grid {
    grid-template-columns: 1fr;
  }

  /* Tables become horizontally scrollable */
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  /* Page header stacks */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: .8rem;
  }

  .page-header .filter-input {
    width: 100%;
    max-width: none;
  }

  /* Filter bar stacks */
  .filter-bar {
    flex-direction: column;
  }

  .filter-bar .filter-input,
  .filter-bar select {
    width: 100%;
  }

  /* Search bar stacks */
  .search-bar {
    flex-direction: column;
  }

  .search-bar .filter-input {
    width: 100%;
  }

  /* Hero padding adjustment */
  .hero {
    padding: 2rem 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  /* Auth card full width on mobile */
  .card {
    padding: 1.5rem;
    max-width: none;
    margin: 0 1rem;
  }

  /* Modal full width with padding */
  .modal {
    margin: 0 1rem;
    max-width: calc(100vw - 2rem);
  }

  /* Wallet status wraps */
  .wallet-status {
    flex-wrap: wrap;
  }

  /* Op grid single column */
  .op-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  /* Ultra-small screens */
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .content h2 {
    font-size: 1.3rem;
  }

  .btn {
    padding: .5rem 1rem;
    font-size: .85rem;
  }

  th, td {
    padding: .5rem .7rem;
    font-size: .8rem;
  }
}

/* ── Page Visit Counter ────────────────────────────────────────────────── */
.page-visit-counter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: #f9fafb;
  border-radius: 8px;
  font-size: 0.75rem;
  color: #6b7280;
  border: 1px solid #e5e7eb;
}

.page-visit-counter strong {
  color: #4f46e5;
  font-weight: 600;
}

/* Position in sidebar */
.sidebar .page-visit-counter {
  margin-top: auto;
  margin-bottom: 1rem;
  text-align: center;
  justify-content: center;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .sidebar .page-visit-counter {
    font-size: 0.7rem;
    padding: 0.3rem 0.6rem;
  }
}